Can someone please explain the difference between the whatis command and the apropos command? I noticed that both appear to be installed by default and I'm not sure what the difference is between them.
I'm wondering what's the difference between "man 3 command" vs "man command"?
I read in wiki (http://en.wikipedia.org/wiki/Man_page) that man 3 is used in Linux in section 3 of the man pages. And section 3 refers to Library functions, covering in particular the C standard library.